Powertrain, generic (extended)

P2836 Shift Fork B Position Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2836 is the umbrella circuit code for the shift fork B position input. Mercedes-Benz stores P283600 when its 8G-DCT dual-clutch transmission (724.1) detects an electrical defect at the fork B sensor and includes it in the code set evaluated by its Intelligent Predictive Repair routine in XENTRY. Ford's 2012 summary gives the number a different job on the DPS6 gearbox of Focus and Fiesta: a fault in the motor-current chip (ATIC) inside the TCM that drives the second shift drum, which according to its stuck-in-gear codes serves second, fourth, sixth and reverse. GM's Corvette software and Ford's TR9070 never use P2836 and report fork B problems through P2837 to P283A. Usually the gears moved by fork B are withdrawn and a substitute program takes over.

Likely causes

Electrical defect in the fork B position sensor (Mercedes 8G-DCT)
Failed current-control chip for the second shift drum motor in the TCM (Ford DPS6)
Corroded or loose contacts between sensor and module

Symptoms

  • Transmission warning and stored code
  • Gears of fork B skipped or unavailable
  • Delayed engagement from Park or no drive (Ford DPS6)

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–2,500
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift fork bshift fork position sensor bwiring harness

Related codes

P2837P2838P2839P283AP2831

References: static.nhtsa.gov, newtonnet.co.uk.